In order to help getting debian live CDs boot from encrypted partitions by the help of GRUB2, I created this small tutorial for setting up a test environment. Of course you can install grub2 yourself on a pendrive, but I wanted it to be easy for everyone. So I require you to use GNOME Disks Version 3.8 as you get it in Debian experimental (not unstable yet) package gnome-disk-utility.